Abstract
The ground-state rotational spectra of ten isotopomers of the carbon monoxide—acetylene dimer are reported and the spectroscopic constants B O and D J determined in the usual way in a semirigid rotor fit for a linear molecule. The B O values are consistent with a simple linear model of the dimer with nuclei in the order OC…HCCH. The failure to observe the isotopomer OC…HCCD in mixtures of CO and HCCD is interpreted in terms of a zero-point energy difference rather than in terms of a nearly free internal rotation of the acetylene subunit.
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